Finding the Fourth Proportional to 21,003.67, 31,517.99 and 10,616.47

Step by Step Solution

1. Step 1: Write the proportion equation
   21,003.67 : 31,517.99 = 10,616.47 : x
2. Step 2: Convert to fraction form
   21,003.67/31,517.99 = 10,616.47/x
3. Step 3: Cross multiply
   21,003.67x = 31,517.99 × 10,616.47
4. Step 4: Simplify right side
   21,003.67x = 334,609,795.30
5. Step 5: Solve for x
   x = 334,609,795.30/21,003.67
6. Step 6: Final answer
   x = 15,931.02